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authorJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2009-03-27 11:29:02 -0700
committerJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2009-03-30 09:25:36 -0700
commit707ebbc81c61eb480d8a51ca61e355e240df1d32 (patch)
treee43090b2e37545985b4de136c2dc382108f92aff
parentxen: resume interrupts before system devices. (diff)
downloadlinux-dev-707ebbc81c61eb480d8a51ca61e355e240df1d32.tar.xz
linux-dev-707ebbc81c61eb480d8a51ca61e355e240df1d32.zip
xen: set _PAGE_NX in __supported_pte_mask before pagetable construction
Some 64-bit machines don't support the NX flag in ptes. Check for NX before constructing the kernel pagetables. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
-rw-r--r--arch/x86/xen/enlighten.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index da33e0c5870d..80f4c5343495 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -42,6 +42,7 @@
#include <asm/xen/hypervisor.h>
#include <asm/fixmap.h>
#include <asm/processor.h>
+#include <asm/proto.h>
#include <asm/msr-index.h>
#include <asm/setup.h>
#include <asm/desc.h>
@@ -912,7 +913,6 @@ static const struct machine_ops __initdata xen_machine_ops = {
.emergency_restart = xen_emergency_restart,
};
-
/* First C function to be called on Xen boot */
asmlinkage void __init xen_start_kernel(void)
{
@@ -980,6 +980,11 @@ asmlinkage void __init xen_start_kernel(void)
if (!xen_initial_domain())
__supported_pte_mask &= ~(_PAGE_PWT | _PAGE_PCD);
+#ifdef CONFIG_X86_64
+ /* Work out if we support NX */
+ check_efer();
+#endif
+
/* Don't do the full vcpu_info placement stuff until we have a
possible map and a non-dummy shared_info. */
per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];